With 2007's Bleeding Love, Leona Lewis became the first X Factor winner to achieve a worldwide smash hit. It spent seven weeks at No 1 in the UK, sold 4m downloads in the US, and has total worldwide sales of 9m copies. It's still the marker for aspiring X Factor contestants (if you were wondering, Cher Lloyd's Swagger Jagger doesn't match up). But despite initial success – Lewis's debut album, Spirit, also peaked at No 1 on both sides of the Atlantic – her follow-up, Echo, failed to continue the trend. So, it was back to the drawing board. Collide is the first single from her as yet untitled third album, due later this year. Co-written and produced by Sandy Vee and Autumn Rowe, who have previously worked for Rihanna, David Guetta and Katy Perry, Collide places Lewis's not inconsiderable voice in a more dance-orientated context, a pounding beat forming the spine of the song while a vaguely house piano riff skips around it. Structurally, it's a bit all over the place – it seems to build and drop at the wrong times – and there are allegations that the song bears more than a passing resemblance to Avicii's track Penguin (Lewis's label claims the song is credited, but the DJ said he was never approached in the first place). That said, Lewis does a more than passable job as a dance diva.